GitHub/sdrtrunk
1
0
Fork 0
mirror of https://github.com/DSheirer/sdrtrunk.git synced 2026-11-12 08:37:25 -05:00
Code Issues Packages Projects Releases 2 Wiki Activity

P25 LSM decoder work in progress. Adds a CQPSK decoder based on Max's (KA1RBI) scope.py and gardner loop.

Browse Source 
The CQPSK decoder is starting to take shape, but needs more tweaking and testing.  It's not keeping a good lock on strong P25 signals.  I have to add some more features to the intrumentation package to allow me to visualize the internals of the CQPSK decoder so that I can get a better sense of what needs fine tuning.

The CQPSK decoder may work for anyone that wants to sync the repo and run the build script.
This commit is contained in:
dennis.sheirer
2015-02-10 00:42:08 +00:00
parent 9310fb0daf
commit a65e821e85
43 changed files with 1996 additions and 413 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/gui/control/ConstellationViewer.java
View File

@@ -80,6 +80,8 @@ public class ConstellationViewer extends JPanel
{
mBuffer.receive( sample );
ComplexSample angle = ComplexSample.multiply( sample, mPrevious.conjugate() );
repaint();
}
@@ -105,7 +107,6 @@ public class ConstellationViewer extends JPanel
Graphics2D graphics = (Graphics2D) g;
// graphics.setBackground( Color.BLACK );
graphics.setColor( Color.BLUE );
List<ComplexSample> samples = mBuffer.getElements();
@@ -113,15 +114,12 @@ public class ConstellationViewer extends JPanel
double centerX = (double)getHeight() / 2.0d;
double centerY = (double)getWidth() / 2.0d;
// double scale = centerX / 2.0d;
double scale = 0.5d;
mCounter = 0;
for( ComplexSample sample: samples )
{
if( mCounter > ( mOffset + mSamplesPerSymbol ) )
{
/**
@@ -135,7 +133,6 @@ public class ConstellationViewer extends JPanel
double q = ( sample.quadrature() * mPrevious.inphase() ) +
( sample.inphase() * -mPrevious.quadrature() );
mLog.debug( "i:" + i + " q:" + q );
double angle;
//Check for divide by zero
@@ -165,9 +162,6 @@ public class ConstellationViewer extends JPanel
}
mCounter++;
// mLog.debug( "Plotting x:" + ( centerX - ( sample.x() * scale ) ) +
// " y:" + ( centerY - ( sample.y() * scale ) ) + " for sample " + sample.toString() );
}
}